Geoege dueyee



(No Model.) G. D'URYEE.

URUSHINGAND GRINDING MACHINE.

Patnted Jan. 3,1882.

L/MM ZL, 57W

UNITED STATES PATENT OFFICE.

GEORGE DURYEE', OF RAHWAY, NEW JERsEY'.

CRUSHING AND GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 251,848,1dated January 8, 1882. Application filed November 20, 1880. Renewed November 29, 1881. (No model.)

To all whom it may concern:

Be it known that I, GEORGE DURYEE, a citizen of the United States, residing at Rahway, in the county of Union and State of New Jersey, have invented a new and useful Crushing and Grinding Machine, of which the following is a specification.

My machine is constructed with a pair of heads, of east-iron or cast-steel, mounted on shafts geared together so as to rotate in unison, each head consisting of a pair of double cam-shaped arms or projections, and the heads being so combined that the projections of one will pass within depressions between the projections of the other. The prominent convex portions of each head are provided with teeth of hardened steel, which are preferably made square in transverse section, so as to he slipped endwise into suitable sockets, and will have four cutting edges, which may be used in succession by turning the tooth one-quarter round as each edge becomes worn. The concave portions ofeach head are formed with corrugations within which the material is crushed and ground by the teeth of the other head, the said corrugations being formed in removable inserted plates of steel or of chilled cast-iron.

In order that my said invention maybe fully understood, I will proceed to describe it with reference to the accompanying drawings, in which- I I Figure 1 represents a vertical section of the machine in a plane transverse to the shafts. Fig. 2 is a longitudinal section on the line 2 2, Fig. 1. a

A B represent a pair of shafts geared together by cog-wheels (J D, so as to cause them to rotate in unison in opposite directions. 0n the shafts A B are firmly keyed heads E E, each formed of a pair of cam-shaped projections, E E, with concave depressions between them. The concave depressions are formed of inserted and removable plates F, of tempered I steel,or of iron cast in chills with corrugations 5 f f, which are thereby rendered exceedingly down and crushing the materials descending from the hopper. As the extremities of the cams, by reason of their greater radius, move at a much higher velocity, the teeth G exert an e'fl'ective grinding action over the corrugated 'surfacesff, reducing the material to any desired fineness according as the apparatus may be set." Thesetting of the heads to or from each other may be effected to a moderate and sufficient extent by means ofwedges, holding and moving sliding boxes in which the shafts A B have their bearings.

The apparatus is well adapted for crushing quartz and rock of all kinds, and for grinding wood for paper-pulp, bones, shells, and other manures, ear corn, and many other materials.

The inserted teeth G and corrugated plates F are cheaply renewed when worn or broken.

Having thus described my invention, what lclaim as new therein, and desire to secure by Letters Patent, is-

The combination of the shaftsA B and grind ing-heads E E, the latter being constructed and arranged as herein described and provided on their salient extremities with removable angular teeth G and on their concave surfaces with removable corrugated plates F, said teeth G being carried over the surfaces of I the corrugated grindingplates F with a crushing and grinding action, as herein described and shown.-

' GEORGE DURYEE.

Witnesses:

' OGTAVIUS KNIGHT, HARRY E. KNIGHT. 

